{
  "alt": "County map of the United States shaded by the mean score on the first pollution component. Counties at the high end are few and sit in dense metropolitan areas, among them the Chicago, New York and Los Angeles areas, and most counties are at the low end. Alaska and Hawaii are gray.",
  "caption": "Counties toward the high end of the key hold tracts with high combined percentiles for traffic, diesel PM, NO₂ and hazardous-waste proximity, and most counties sit toward the low end. Cook County has a mean score of {fact:corridor_top} and the median county {fact:corridor_q50}. The {fact:n_map_nodata} gray counties have no score, and the tooltip says why.",
  "data": [],
  "id": "pc1_map",
  "notes": [
    "A county is mapped when at least {fact:map_cover_min} of its residents live in tracts with all {fact:n_indicators} indicators. Gray counties have no score: Alaska and Hawaii (no PM₂.₅ or ozone estimate), and a few counties where fewer tracts have all of them. Puerto Rico has no PM₂.₅ or ozone estimate and is not drawn.",
    "Connecticut is drawn as its eight legacy counties, with tracts assigned to them by the staged crosswalk. Scores are county means of modeled tract values and carry no sampling interval.",
    "The key runs from the first to the 99th percentile of the county scores, and counties outside that range take the colors of its two ends; the tooltip gives the value."
  ],
  "source": "EPA EJScreen 2024, first principal component of the 13 national percentiles; population-weighted county means, modeled estimates",
  "spec": {
    "fips": "fips",
    "legendLabel": "Mean score on the first component (standard deviations of the tract score)",
    "payload": "pc1_map.json",
    "scale": {
      "domain": [
        -2,
        0.9
      ],
      "ends": [
        "Lower combined percentiles",
        "Higher combined percentiles"
      ],
      "palette": "seq",
      "type": "sequential"
    },
    "tooltipKeys": [
      "n_tracts",
      "residents"
    ],
    "tooltipLabels": {
      "n_tracts": "Tracts in the score",
      "residents": "Residents of those tracts"
    },
    "value": "pc1",
    "valueFormat": {
      "digits": 1
    }
  },
  "subtitle": "Population-weighted county mean of the tract score on the first principal component of 13 EJScreen percentiles, in standard deviations of the tract score",
  "title": "The urban-industrial component is highest in Cook County, Illinois, and in dense counties around New York, and below the tract average in most counties",
  "type": "county-map",
  "width": "full"
}